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T89C51RD2-DDFC-L View Datasheet(PDF) - Atmel Corporation

Part Name
Description
Manufacturer
T89C51RD2-DDFC-L
Atmel
Atmel Corporation Atmel
T89C51RD2-DDFC-L Datasheet PDF : 86 Pages
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T89C51RD2
Write to
CCAPnL Reset
CF CR
Write to
CCAPnH
CCAPnH
CCAPnL
1
0
Enable
16 bit comparator
CCON
CCF4 CCF3 CCF2 CCF1 CCF0 0xD8
PCA IT
Match
CH
CL
CEXn
PCA counter/timer
CCAPMn, n = 0 to 4
ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn 0xDA to 0xDE
Figure 11. PCA High Speed Output Mode
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, otherwise an unwanted
match could happen.
Once ECOM set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t occur while modifying
the compare value. Writing to CCAPnH will set ECOM. For this reason, user software should write CCAPnL first,
and then CCAPnH. Of course, the ECOM bit can still be controlled by accessing to CCAPMn register.
6.5.4. Pulse Width Modulator Mode
All of the PCA modules can be used as PWM outputs. Figure 12 shows the PWM function. The frequency of the
output depends on the source for the PCA timer. All of the modules will have the same frequency of output
because they all share the PCA timer. The duty cycle of each module is independently variable using the module's
capture register CCAPLn. When the value of the PCA CL SFR is less than the value in the module's CCAPLn
Rev. F - 15 February, 2001
30
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